Quotations -- Quotation within a Quotation
Use single quotation marks when the source you are quoting contains a quotation within it.
According to psychiatrist Arthur Kleinman, agreement about treatment and prognosis for mental illness leads to "the view that depression, schizophrenia, and phobias are 'things' in the real world" (11).
Exception: In a block quotation, use double quotation marks if the source contains a quotation within it.
Click here to read more about punctuation with quotations.